Chief Minister Punjab Shehbaz Sharif, who would be hosting a dinner in the honour of Sadiq Khan, took to Twitter and welcomed the visiting dignitary.
Mr Khan's Muslim parents were both born in India and then lived in Pakistan before emigrating to Britain in 1968. He had earlier stayed in India for three days where he met politicians and other important personages in Mumbai, Delhi and Amritsar.
Plans for the service, which would make it easier those living in areas not served by the Tube, which already runs a Boxing Day service, to visit relatives and enjoy the festive sales were first announced a year ago.
Earlier in the day, while visiting the Golden Temple at Amritsar in India, Mr Khan called on the British government on Wednesday to make a formal apology for the 1919 Jallianwala Bagh massacre in which almost 400 people were shot dead by British Indian army soldiers. PM Abbasi said that successful efforts to eradicate the menace of terrorism have made Pakistan an opportune destination for United Kingdom businesses.
Sadiq Khan is now taking part in the first ever trade mission by a London mayor to India and Pakistan. "We appreciate the cooperation of British people", he said.
"The foreign minister also briefed the mayor about Pakistan's successes in the economic field and the regional situation", a Foreign Office statement said.
Commenting on the Mayor's response, Ms Pidgeon said: "Sadiq Khan likes to boast about the start of the London Overground night service but he can not hide away from the fact Londoners have always been promised a Boxing Day service on the London Overground". "I am happy to know that Pakistan's economy is growing", he said, while thanking the mayor for according him a warm welcome.
Sadiq Khan said that Pakistan and London share a long and unique history that has had a profound influence on shaping our respective societies, economies, and cultures.
The mayor was born and raised in Tooting, South London.